Hand grip strength tester



FIG. 1 is a perspective view of a hand grip strength tester which embodies my design;

FIG. 2 is a left side view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for an hand grip strength tester, as shown and described. 